One of the great Alister MacKenzie observations that has been largely ignored is that shortening a hole could affect it positively, instead of negatively. The 6th at The Valley Club is a good example, but there are lots of others.
The idea that making a hole longer makes it better, or that every hole was just the right length when it was built, is the fallacy that has caused so many redesigns and restorations to move a course backwards instead of forwards.
Sometimes a "landlocked" hole offers a key feature to work with that the original designer ignored, because it was out of play in his day. But the best solution for such holes is acceptance.